Optical Network Calculators & Engineering Tools
Everything an FTTH design and ODN planning engineer needs in one place — from the OLT head-end down to the ONT on the subscriber side. Our free, interactive calculators and reference tables let you size a complete PON link in minutes: optical power budgets for GPON, XGS-PON and 10G-EPON, splitter cascade planning for your fiber build, ODF capacity and rack planning, plus quick converters and standards references for wavelengths, losses and connectors. Built for the whole chain — OLT, ODN and ONT — and backed by ITU-T and IEEE standard values, so your figures hold up in real tenders. Get a recommended product configuration with every calculation and request a quote in one click.
End-to-End PON Power Budget Calculator
Estimate total optical loss from OLT to ONT — fiber, connectors, splices and splitter — and check it against the power budget of your PON class. Keeps an operating margin so the link stays healthy over time.
Loss Breakdown
Values are editable defaults based on ITU-T G.652 fiber attenuation, TIA connector insertion-loss limits and typical PLC splitter loss. Always confirm with your vendor datasheet and field OTDR measurements.
FTTH Distribution Capacity Planner
Size a whole service area in one go — from subscribers down to the ODF, FDC distribution cabinets and splitters you need to deploy. Converts a home-passed count into a concrete equipment list for tendering.
Splitter Configuration Planner
Plan the PLC splitter cascade to cover your subscriber count, and see the resulting insertion loss and how many splitters you need — first-stage (at the OLT) and second-stage (at the distribution point).
ODF & Patch Panel Capacity Planner
Size your ODF / patch panel and splice-tray count from the number of fibers you need to terminate, and see the approximate rack space required.
Maximum PON Link Distance
From your power budget, deduct fiber, connector, splice and splitter losses (plus an operating margin) to find the longest usable fiber run between OLT and ONT for a chosen wavelength.
Rack & Cabinet U Planner
Tally the rack units for ODFs, patch panels and splitters you plan to install, and check how many standard 42U cabinets (or telecom frames) you need — so the field build actually fits in the enclosure.
Optical Unit Converter
Convert between the units used every day in optical link budgets and lab work.
dBm ↔ mW
Quick reference
dB ↔ Power Ratio
+3 dB = ×2 power · −3 dB = ×0.5 · +10 dB = ×10 · −10 dB = ×0.1
Power Unit Conversion (mW / W / μW / nW)
Frequency ↔ Wavelength
λ · f = c (c ≈ 299,792,458 m/s)
PON Standard Power Budgets
Optical loss-budget classes and headline specs for the main PON standards — from legacy GPON to the new 25G/50G-PON generation.
| Standard | Rate (DS/US) | DS λ | US λ | Budget classes | Split |
|---|---|---|---|---|---|
| GPON G.984 | 2.5 / 1.25 Gbit/s | 1490 nm | 1310 nm | B+ 28 · C+ 32 · C++ 35 dB | up to 1:128 |
| XGS-PON G.9807.1 | 9.95 / 9.95 Gbit/s | 1577 nm | 1270 nm | N1 29 · N2 31 · E1 33 · E2 35 dB | up to 1:128 |
| 10G-EPON IEEE 802.3av | 10 / 10 (PR) or 10 / 1 Gbit/s | 1577 nm | 1270 nm | PR20 24 · PR30 29 dB | 1:32 / 1:128 |
| NG-PON2 G.989 | 40 / 10-40 Gbit/s (TWDM) | L-band (~1596-1603 nm) | C-band (~1524-1544 nm) | N1-N2-E1-E2 · 14-35 dB | ≥ 1:256 |
| 25G-PON G.9804.3 | 24.88 / 24.88 (or 10) Gbit/s | 1342 nm | 1300 nm | N1 29 · N2 31 · E1 33 · E2 35 dB | up to 1:64 |
| 50G-PON G.9804.3 | 50 / 25 (or 50) Gbit/s | 1342 nm | 1260-1310 nm | N1 14-29 · N2 16-31 · E1 18-33 · E2 20-35 dB | ≥ 1:64 |
Budget classes per ITU-T G.984 / G.9807.1 / G.989 / G.9804.3 and IEEE 802.3av. Loss budgets are the min–max optical-path-loss window each class supports.
Fiber Wavelength Attenuation Reference
Typical single-mode fiber attenuation (attenuation coefficient) for standard G.652 fiber at common ODN wavelengths.
| Wavelength | Typical attenuation | Commonly used for |
|---|---|---|
| 1270 nm | ≈ 0.40 dB/km | XGS-PON upstream |
| 1310 nm | ≈ 0.35 dB/km | GPON upstream / O-band |
| 1342 nm | ≈ 0.31 dB/km | 25G / 50G-PON downstream |
| 1490 nm | ≈ 0.30 dB/km | GPON downstream |
| 1550 nm | ≈ 0.25 dB/km | C-band / DWDM |
| 1577 nm | ≈ 0.25 dB/km | XGS-PON & 10G-EPON downstream |
| 1625 nm | ≈ 0.25-0.35 dB/km | U-band (monitoring) |
Design values for ITU-T G.652 single-mode fiber. Confirm exact numbers with your cable datasheet.
Connector & Splice Insertion Loss
Typical and maximum insertion-loss values to use in a link budget for connectors, splices and splitters.
| Component | Typical loss | Practical planning value |
|---|---|---|
| Connector · APC (SC/LC) | 0.20-0.35 dB | 0.3 dB / pair |
| Connector · UPC (SC/LC) | 0.30-0.50 dB | 0.5 dB / pair |
| Fusion splice | 0.02-0.10 dB | 0.05 dB / splice |
| Mechanical splice | 0.30-0.50 dB | 0.5 dB / splice |
| PLC splitter 1:32 | 15.0 (theoretical) / 17.1 (typical) | 17 dB |
| PLC splitter 1:64 | 18.0 (theoretical) / 20.5 (typical) | 20.5 dB |
Typical values aligned with ANSI/TIA and common vendor datasheets. Always use the tested value for your actual components in final budgeting.
Master the calculation step by step
Walk through the full methodology — transmitter power, receiver sensitivity, fiber loss, connector and splice loss, splitter loss and operating margin — in our guide.
Read the Power Budget GuideDisclaimer: These tools provide planning estimates based on standard industry values. They are not a substitute for vendor datasheets, standards documents or field OTDR measurements. Always verify with your supplier and final on-site testing.
